/*This file is prepared for Doxygen automatic documentation generation.*/
/*! \file *********************************************************************
 *
 * \brief System-specific implementation of the \ref _write function used by
 *         the standard library.
 *
 * - Compiler:           IAR EWAVR32 and GNU GCC for AVR32
 * - Supported devices:  All AVR devices with a USART module can be used.
 * - AppNote:
 *
 * \author               Atmel Corporation: http://www.atmel.com \n
 *                       Support and FAQ: http://support.atmel.no/
 *
 ******************************************************************************/

/* Copyright (c) 2009 Atmel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an Atmel
 * AVR product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "compiler.h"


volatile void *volatile stdio_base;
int (*ptr_put)(void volatile*,int);


#if ( defined(__ICCAVR32__) || defined(__ICCAVR__))

#include <yfuns.h>

_STD_BEGIN

#pragma module_name = "?__write"

/*! \brief Writes a number of bytes, at most \a size, from the memory area
 *         pointed to by \a buffer.
 *
 * If \a buffer is zero then \ref __write performs flushing of internal buffers,
 * if any. In this case, \a handle can be \c -1 to indicate that all handles
 * should be flushed.
 *
 * \param handle File handle to write to.
 * \param buffer Pointer to buffer to read bytes to write from.
 * \param size Number of bytes to write.
 *
 * \return The number of bytes written, or \c _LLIO_ERROR on failure.
 */
size_t __write(int handle, const unsigned char *buffer, size_t size)
{
	size_t nChars = 0;

	if (buffer == 0){
		// This means that we should flush internal buffers.
		return 0;
	}

	// This implementation only writes to stdout and stderr.
	// For all other file handles, it returns failure.
	if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR) {
		return _LLIO_ERROR;
	}

	for (; size != 0; --size) {
		if (ptr_put(stdio_base, *buffer++) < 0) {
			return _LLIO_ERROR;
		}
		++nChars;
	}

  return nChars;
}
_STD_END


#elif (defined(__GNUC__) && !defined(XMEGA))

	int __attribute__((weak))
	_write (int file, char * ptr, int len)
	{
		int nChars = 0;
	
		if ( (file != 1)
			&& (file != 2) && (file!=3))
		return -1;
	
		for (; len != 0; --len) {
			if (ptr_put(stdio_base, *ptr++) < 0) {
				return -1;
			}
			++nChars;
		}
		return nChars;
	}

#elif (defined(__GNUC__) && defined(XMEGA))
	
	int _write (char c, int *f)
	{
		if (ptr_put(stdio_base,c) < 0)
		{
			return -1;
		}
		return 1;
	}

#endif
